颗粒释放临界盐浓度(NaCl溶液)的测定  

Measurement of Critical Salt Concentration for Fine Grain Release (NaCl Solution)

作　　者：韩志勇[1] 郑西来[1] 张晓辉[1] 

机构地区：[1]中国海洋大学环境科学与工程学院,山东青岛266003

出　　处：《工程勘察》2008年第11期37-40,共4页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金资助项目(40272108)

摘　　要：多孔介质的临界盐浓度是在石油工程领域研究Berea砂岩的水敏感性过程中发现的,是指当流过多孔介质的液体盐浓度低于这一极限值时,多孔介质的渗透性就会由于粘土颗粒释放并阻塞孔喉而下降,否则,颗粒释放现象便不会发生,多孔介质渗透性就不会发生下降。临界盐浓度值可以通过孔隙流试验(如水平柱状试验)或批量试验并结合流出物的分析来测定。极限盐浓度只有在一价阳离子溶液中产生,任何高于一价的溶液中都不会出现这一现象。本文以NaCl溶液为例,通过两种不同方法对其临界盐浓度进行了试验室测定。试验结果表明,两种测定方法的结果一致,且NaCl溶液的临界盐浓度并非一个单一的数值,而是一个0.06±0.005mol/L的范围。The critical salt concentration （CSC） of the porous media was discovered in the petroleum engineering field when the water sensitivity of Berea sandstone was studied. The permeability of the porous media would decrease when the concentration of salt solution to the flows through the media is lower than the CSC, because the releasing of fine grains blocks the pore pass. Otherwise, it doesn＇t occur. The CSC could be measured by the pore-fluid flow （such as level column experiment） or by the batch experiment combining with the analysis of the releasing particles. The CSC occurs only in the one-value cation solution. Taking the NaCl solution as an example, the CSC is measured by two different methods in the lab. The testing results indicate that the CSC values of the NaCl solution from the two methods are consistent with each other. The values of the NaCl solution is not the simplex value but with the range of 0.06 4±0.005 mol/L. grain

关 键 词：颗粒释放 临界盐浓度 多孔介质 水敏感性 

分 类 号：X131.2[环境科学与工程—环境科学]